/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.tika.metadata.filter;

import java.util.List;

import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;

public class AttachmentCountingListFilter extends MetadataFilter {
    @Override
    public List<Metadata> filter(List<Metadata> metadataList) throws TikaException {
        if (metadataList == null || metadataList.isEmpty()) {
            return metadataList;
        }
        metadataList.get(0).set("X-TIKA:attachment_count", Integer.toString(metadataList.size() - 1));
        return metadataList;
    }
}
